Door impact beam

Abstract

A door impact beam for a motor vehicle includes a formed metal sheet defined by a longitudinal axis and having a tubular cross section which has a closed circumference in a center portion of the metal sheet, and is configured with open circumference at both end portions of the metal sheet which adjoin the center portion in a direction of the longitudinal axis. Each end portion is defined by an opening angle which continuously increases from the center portion to respective ends of the end portions.

1. A door impact beam for a motor vehicle, comprising:
 a formed metal sheet defined by a longitudinal axis and having a tubular cross section which has a closed circumference in a center portion of the metal sheet, and is configured with open circumference at both end portions of the metal sheet which adjoin the center portion in a direction of the longitudinal axis, each said end portions defined by an opening angle which continuously increases from the center portion to respective ends of the end portions; and 
 a reinforcement plate located inside the center portion at the inner side of the formed metal sheet. 
 
     
     
       2. The door impact beam  1 , wherein the metal sheet has length side zones which overlap in the center portion. 
     
     
       3. The door impact beam  1 , wherein the metal sheet has length sides joined end-to-end in the center portion. 
     
     
       4. The door impact beam of  claim 1  wherein the reinforcement plate is defined by an opening angle which is greater than the opening angle of the end portions in a transition to the center portion. 
     
     
       5. The door impact beam  1 , wherein the opening angles of the end portions are differently sized in a transition to the center portion. 
     
     
       6. The door impact beam of  claim 1 , wherein the reinforcement plate is arranged at a distance to length sides in the center portion. 
     
     
       7. The door impact beam  1 , wherein the opening angle of the end portions ranges from 10° to 100° in a transition to the center portion. 
     
     
       8. The door impact beam  1 , wherein the opening angle of the end portions ranges between 120° and 180° at a free end of the end portions. 
     
     
       9. The door impact beam of  claim 3 , wherein the length sides and/or length side zones of the metal sheet are joined through material union in at least two areas. 
     
     
       10. The door impact beam of  claim 1 , wherein the reinforcement plate has a length which is 40% to 100% of a length of the center portion. 
     
     
       11. The door impact beam of  claim 1 , wherein the reinforcement plate has a length which is 40% to 70% of a length of the center portion. 
     
     
       12. The door impact beam  1 , further comprising attachment brackets formed in one piece with the end portions and disposed at ends of the end portions for attachment of a door. 
     
     
       13. The door impact beam  1 , further comprising separate attachment brackets connected at opposite ends of the end portions for attachment of a door by material union or interference fit.